In every moment of subjective experience there is a quality of pleasure, displeasure or neutrality. Bring mindfulness to the quality of Vedana trains us how not to add suffering when pain arises or pleasure fades.
From the basis of our simple practices we can include mindfulness of how intentions and actions arise in reaction to what is pleasant, unpleasant, and neutral (vedana). The unconscious actions we take in response to vedana are the conditioning circumstances for our suffering. It behooves us to raise awareness to how our reactivity to vedana further conditions our patterns of craving, aversion, and ignorance.